firefox-main/testing/web-platform/tests/xml/retain_redundant_xmlns.html

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<!DOCTYPE html>
<meta charset="utf-8">
<title>XML Redundant Namespace Declaration Attribute Retention</title>
<link rel="help" href="https://www.w3.org/TR/xml-names/#ns-decl">
<meta name="assert" content="For web compatibility, the parser should reproduce xmlns attributes on elements even if the same namespace was already in scope.">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
'use strict';
const testCases = [
{
description: 'Non-prefixed: xmlns attribute is retained when same default namespace is already in scope on parent',
xml: '<root xmlns="http://example.com"><child xmlns="http://example.com"/></root>',
attributeName: 'xmlns',
expectedValue: 'http://example.com',
},
{
description: 'Non-prefixed: xmlns attribute is retained when intermediate element has no explicit namespace declaration',
xml: '<root xmlns="http://example.com"><intermediate><child xmlns="http://example.com"/></intermediate></root>',
attributeName: 'xmlns',
expectedValue: 'http://example.com',
},
{
description: 'Prefixed: xmlns:p attribute is retained when same prefix namespace is already in scope on parent',
xml: '<root xmlns:p="http://example.com"><child xmlns:p="http://example.com"/></root>',
attributeName: 'xmlns:p',
expectedValue: 'http://example.com',
},
];
for (const { description, xml, attributeName, expectedValue } of testCases) {
test(() => {
const doc = new DOMParser().parseFromString(xml, 'text/xml');
const child = doc.getElementsByTagName('child')[0];
assert_true(child.hasAttribute(attributeName), `child should have '${attributeName}' attribute`);
assert_equals(child.getAttribute(attributeName), expectedValue);
}, description);
}
</script>